forked from OSchip/llvm-project
327 lines
11 KiB
C++
327 lines
11 KiB
C++
//===-- llc.cpp - Implement the LLVM Native Code Generator ----------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This is the llc code generator driver. It provides a convenient
|
|
// command-line interface for generating native assembly-language code
|
|
// or C code, given LLVM bitcode.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Bitcode/ReaderWriter.h"
|
|
#include "llvm/CodeGen/FileWriters.h"
|
|
#include "llvm/CodeGen/LinkAllCodegenComponents.h"
|
|
#include "llvm/CodeGen/LinkAllAsmWriterComponents.h"
|
|
#include "llvm/Target/SubtargetFeature.h"
|
|
#include "llvm/Target/TargetData.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Target/TargetMachineRegistry.h"
|
|
#include "llvm/Transforms/Scalar.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/ModuleProvider.h"
|
|
#include "llvm/PassManager.h"
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/Support/CommandLine.h"
|
|
#include "llvm/Support/FileUtilities.h"
|
|
#include "llvm/Support/ManagedStatic.h"
|
|
#include "llvm/Support/MemoryBuffer.h"
|
|
#include "llvm/Support/PluginLoader.h"
|
|
#include "llvm/Support/RegistryParser.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include "llvm/Analysis/Verifier.h"
|
|
#include "llvm/System/Signals.h"
|
|
#include "llvm/Config/config.h"
|
|
#include "llvm/LinkAllVMCore.h"
|
|
#include <fstream>
|
|
#include <iostream>
|
|
#include <memory>
|
|
using namespace llvm;
|
|
|
|
// General options for llc. Other pass-specific options are specified
|
|
// within the corresponding llc passes, and target-specific options
|
|
// and back-end code generation options are specified with the target machine.
|
|
//
|
|
static cl::opt<std::string>
|
|
InputFilename(cl::Positional, cl::desc("<input bitcode>"), cl::init("-"));
|
|
|
|
static cl::opt<std::string>
|
|
OutputFilename("o", cl::desc("Output filename"), cl::value_desc("filename"));
|
|
|
|
static cl::opt<bool> Force("f", cl::desc("Overwrite output files"));
|
|
|
|
static cl::opt<bool> Fast("fast",
|
|
cl::desc("Generate code quickly, potentially sacrificing code quality"));
|
|
|
|
static cl::opt<std::string>
|
|
TargetTriple("mtriple", cl::desc("Override target triple for module"));
|
|
|
|
static cl::opt<const TargetMachineRegistry::entry*, false,
|
|
RegistryParser<TargetMachine> >
|
|
MArch("march", cl::desc("Architecture to generate code for:"));
|
|
|
|
static cl::opt<std::string>
|
|
MCPU("mcpu",
|
|
cl::desc("Target a specific cpu type (-mcpu=help for details)"),
|
|
cl::value_desc("cpu-name"),
|
|
cl::init(""));
|
|
|
|
static cl::list<std::string>
|
|
MAttrs("mattr",
|
|
cl::CommaSeparated,
|
|
cl::desc("Target specific attributes (-mattr=help for details)"),
|
|
cl::value_desc("a1,+a2,-a3,..."));
|
|
|
|
cl::opt<TargetMachine::CodeGenFileType>
|
|
FileType("filetype", cl::init(TargetMachine::AssemblyFile),
|
|
cl::desc("Choose a file type (not all types are supported by all targets):"),
|
|
cl::values(
|
|
clEnumValN(TargetMachine::AssemblyFile, "asm",
|
|
"Emit an assembly ('.s') file"),
|
|
clEnumValN(TargetMachine::ObjectFile, "obj",
|
|
"Emit a native object ('.o') file [experimental]"),
|
|
clEnumValN(TargetMachine::DynamicLibrary, "dynlib",
|
|
"Emit a native dynamic library ('.so') file"
|
|
" [experimental]"),
|
|
clEnumValEnd));
|
|
|
|
cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
|
|
cl::desc("Do not verify input module"));
|
|
|
|
|
|
// GetFileNameRoot - Helper function to get the basename of a filename.
|
|
static inline std::string
|
|
GetFileNameRoot(const std::string &InputFilename) {
|
|
std::string IFN = InputFilename;
|
|
std::string outputFilename;
|
|
int Len = IFN.length();
|
|
if ((Len > 2) &&
|
|
IFN[Len-3] == '.' && IFN[Len-2] == 'b' && IFN[Len-1] == 'c') {
|
|
outputFilename = std::string(IFN.begin(), IFN.end()-3); // s/.bc/.s/
|
|
} else {
|
|
outputFilename = IFN;
|
|
}
|
|
return outputFilename;
|
|
}
|
|
|
|
static raw_ostream *GetOutputStream(const char *ProgName) {
|
|
if (OutputFilename != "") {
|
|
if (OutputFilename == "-")
|
|
return &outs();
|
|
|
|
// Specified an output filename?
|
|
if (!Force && std::ifstream(OutputFilename.c_str())) {
|
|
// If force is not specified, make sure not to overwrite a file!
|
|
std::cerr << ProgName << ": error opening '" << OutputFilename
|
|
<< "': file exists!\n"
|
|
<< "Use -f command line argument to force output\n";
|
|
return 0;
|
|
}
|
|
// Make sure that the Out file gets unlinked from the disk if we get a
|
|
// SIGINT
|
|
sys::RemoveFileOnSignal(sys::Path(OutputFilename));
|
|
|
|
std::string error;
|
|
raw_ostream *Out = new raw_fd_ostream(OutputFilename.c_str(), true, error);
|
|
if (!error.empty()) {
|
|
std::cerr << error << '\n';
|
|
delete Out;
|
|
return 0;
|
|
}
|
|
|
|
return Out;
|
|
}
|
|
|
|
if (InputFilename == "-") {
|
|
OutputFilename = "-";
|
|
return &outs();
|
|
}
|
|
|
|
OutputFilename = GetFileNameRoot(InputFilename);
|
|
|
|
bool Binary = false;
|
|
switch (FileType) {
|
|
case TargetMachine::AssemblyFile:
|
|
if (MArch->Name[0] == 'c') {
|
|
if (MArch->Name[1] == 0)
|
|
OutputFilename += ".cbe.c";
|
|
else if (MArch->Name[1] == 'p' && MArch->Name[2] == 'p')
|
|
OutputFilename += ".cpp";
|
|
else
|
|
OutputFilename += ".s";
|
|
} else
|
|
OutputFilename += ".s";
|
|
break;
|
|
case TargetMachine::ObjectFile:
|
|
OutputFilename += ".o";
|
|
Binary = true;
|
|
break;
|
|
case TargetMachine::DynamicLibrary:
|
|
OutputFilename += LTDL_SHLIB_EXT;
|
|
Binary = true;
|
|
break;
|
|
}
|
|
|
|
if (!Force && std::ifstream(OutputFilename.c_str())) {
|
|
// If force is not specified, make sure not to overwrite a file!
|
|
std::cerr << ProgName << ": error opening '" << OutputFilename
|
|
<< "': file exists!\n"
|
|
<< "Use -f command line argument to force output\n";
|
|
return 0;
|
|
}
|
|
|
|
// Make sure that the Out file gets unlinked from the disk if we get a
|
|
// SIGINT
|
|
sys::RemoveFileOnSignal(sys::Path(OutputFilename));
|
|
|
|
std::string error;
|
|
raw_ostream *Out = new raw_fd_ostream(OutputFilename.c_str(), Binary, error);
|
|
if (!error.empty()) {
|
|
std::cerr << error << '\n';
|
|
delete Out;
|
|
return 0;
|
|
}
|
|
|
|
return Out;
|
|
}
|
|
|
|
// main - Entry point for the llc compiler.
|
|
//
|
|
int main(int argc, char **argv) {
|
|
llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
|
|
cl::ParseCommandLineOptions(argc, argv, "llvm system compiler\n");
|
|
sys::PrintStackTraceOnErrorSignal();
|
|
|
|
// Load the module to be compiled...
|
|
std::string ErrorMessage;
|
|
std::auto_ptr<Module> M;
|
|
|
|
std::auto_ptr<MemoryBuffer> Buffer(
|
|
MemoryBuffer::getFileOrSTDIN(InputFilename, &ErrorMessage));
|
|
if (Buffer.get())
|
|
M.reset(ParseBitcodeFile(Buffer.get(), &ErrorMessage));
|
|
if (M.get() == 0) {
|
|
std::cerr << argv[0] << ": bitcode didn't read correctly.\n";
|
|
std::cerr << "Reason: " << ErrorMessage << "\n";
|
|
return 1;
|
|
}
|
|
Module &mod = *M.get();
|
|
|
|
// If we are supposed to override the target triple, do so now.
|
|
if (!TargetTriple.empty())
|
|
mod.setTargetTriple(TargetTriple);
|
|
|
|
// Allocate target machine. First, check whether the user has
|
|
// explicitly specified an architecture to compile for.
|
|
if (MArch == 0) {
|
|
std::string Err;
|
|
MArch = TargetMachineRegistry::getClosestStaticTargetForModule(mod, Err);
|
|
if (MArch == 0) {
|
|
std::cerr << argv[0] << ": error auto-selecting target for module '"
|
|
<< Err << "'. Please use the -march option to explicitly "
|
|
<< "pick a target.\n";
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
// Package up features to be passed to target/subtarget
|
|
std::string FeaturesStr;
|
|
if (MCPU.size() || MAttrs.size()) {
|
|
SubtargetFeatures Features;
|
|
Features.setCPU(MCPU);
|
|
for (unsigned i = 0; i != MAttrs.size(); ++i)
|
|
Features.AddFeature(MAttrs[i]);
|
|
FeaturesStr = Features.getString();
|
|
}
|
|
|
|
std::auto_ptr<TargetMachine> target(MArch->CtorFn(mod, FeaturesStr));
|
|
assert(target.get() && "Could not allocate target machine!");
|
|
TargetMachine &Target = *target.get();
|
|
|
|
// Figure out where we are going to send the output...
|
|
raw_ostream *Out = GetOutputStream(argv[0]);
|
|
if (Out == 0) return 1;
|
|
|
|
// If this target requires addPassesToEmitWholeFile, do it now. This is
|
|
// used by strange things like the C backend.
|
|
if (Target.WantsWholeFile()) {
|
|
PassManager PM;
|
|
PM.add(new TargetData(*Target.getTargetData()));
|
|
if (!NoVerify)
|
|
PM.add(createVerifierPass());
|
|
|
|
// Ask the target to add backend passes as necessary.
|
|
if (Target.addPassesToEmitWholeFile(PM, *Out, FileType, Fast)) {
|
|
std::cerr << argv[0] << ": target does not support generation of this"
|
|
<< " file type!\n";
|
|
if (Out != &outs()) delete Out;
|
|
// And the Out file is empty and useless, so remove it now.
|
|
sys::Path(OutputFilename).eraseFromDisk();
|
|
return 1;
|
|
}
|
|
PM.run(mod);
|
|
} else {
|
|
// Build up all of the passes that we want to do to the module.
|
|
ExistingModuleProvider Provider(M.release());
|
|
FunctionPassManager Passes(&Provider);
|
|
Passes.add(new TargetData(*Target.getTargetData()));
|
|
|
|
#ifndef NDEBUG
|
|
if (!NoVerify)
|
|
Passes.add(createVerifierPass());
|
|
#endif
|
|
|
|
// Ask the target to add backend passes as necessary.
|
|
MachineCodeEmitter *MCE = 0;
|
|
|
|
switch (Target.addPassesToEmitFile(Passes, *Out, FileType, Fast)) {
|
|
default:
|
|
assert(0 && "Invalid file model!");
|
|
return 1;
|
|
case FileModel::Error:
|
|
std::cerr << argv[0] << ": target does not support generation of this"
|
|
<< " file type!\n";
|
|
if (Out != &outs()) delete Out;
|
|
// And the Out file is empty and useless, so remove it now.
|
|
sys::Path(OutputFilename).eraseFromDisk();
|
|
return 1;
|
|
case FileModel::AsmFile:
|
|
break;
|
|
case FileModel::MachOFile:
|
|
MCE = AddMachOWriter(Passes, *Out, Target);
|
|
break;
|
|
case FileModel::ElfFile:
|
|
MCE = AddELFWriter(Passes, *Out, Target);
|
|
break;
|
|
}
|
|
|
|
if (Target.addPassesToEmitFileFinish(Passes, MCE, Fast)) {
|
|
std::cerr << argv[0] << ": target does not support generation of this"
|
|
<< " file type!\n";
|
|
if (Out != &outs()) delete Out;
|
|
// And the Out file is empty and useless, so remove it now.
|
|
sys::Path(OutputFilename).eraseFromDisk();
|
|
return 1;
|
|
}
|
|
|
|
Passes.doInitialization();
|
|
|
|
// Run our queue of passes all at once now, efficiently.
|
|
// TODO: this could lazily stream functions out of the module.
|
|
for (Module::iterator I = mod.begin(), E = mod.end(); I != E; ++I)
|
|
if (!I->isDeclaration())
|
|
Passes.run(*I);
|
|
|
|
Passes.doFinalization();
|
|
}
|
|
|
|
// Delete the ostream if it's not a stdout stream
|
|
if (Out != &outs()) delete Out;
|
|
|
|
return 0;
|
|
}
|